Micromod MOD: MODBUS RTU Communications Guide - Manual (Page 19)

MODBUS RTU
COMUNICATIONS GUIDE
15
HOST CONFIGURATION EXAMPLES
MODBUS WITH FIX AND COMMANDER 150
Either the MB1 or EMP driver may be used, though EMP is recommended. The MODBUS guide uses 1 and
2-digit numbers for addresses. Note that the actual addressing requires a 5-digit number. For digital
addresses, use 000xx format, where xx represents the coil address from the instruction book. For analog
addresses, use 400xx format, where xx represents the register address from the instruction book.
Table 6. MODBUS with FIX and Commander 150
Poll Record Configuration
Hardware
MODBUS
Addressing Type 5-Digit
Bit Base 0-15
Data Types Unsigned - Positive Analog Ranges (up to 9999)
Signed - Analog Ranges (between -999 and +9999)
Long - Analog Double Register Values (between -9999 and 99999)
Database Configuration
Data Type Database Block Address Range Notes
Digital Input DI 000xx
Digital Output DO 000xx
Digital I/O DR 000xx select output enable
Analog Input AI 400xx LIN Signal Conditioning
Analog Output AO 400xx LIN Signal Conditioning
Analog I/O AR 400xx LIN Signal Conditioning
NOTES:
1. Each line of the poll record can have no more than 8 analog or 16 digital addresses.
2. It is acceptable to “read through” undefined addresses.
3. Use a calculation block to scale for proper decimal point position.